煤田地质与勘探2023，Vol.51Issue(12)：57-68,12.DOI:10.12363/issn.1001-1986.23.11.0761
高精度LiDAR技术在活动断层断错地貌研究中的应用
Application of high-precision LiDAR technology in research on active fault-induced offset geomorphic features-A case study of the Juxian-Tancheng segment of the Yishu fault zone
摘要
Abstract
The Tancheng-Lujiang fault zone(also referred to as the TanLu fault zone),one of the most significant large-scale active faults in eastern China,has great seismogenic potential while passing through several cities with the activit-ies and accumulation of human beings.To investigate the geometric distribution and activity characteristics of the TanLu fault zone,this study focused on the Juxian-Tancheng segment of the Yishu fault zone-a part of the TanLu fault zone.Given the vegetation coverage in eastern China,airborne light detection and ranging(LiDAR)and terrestrial laser scan-ning were employed to collect high-precision topographic data of the Zuoshan(Yibujian),Zhonghuashan,Jishan,and Maolingshan segments of the Yishu fault zone,as well as the Jiangjialing area.Based on these data,this study analyzed the slip distribution of the faults.The measured point cloud data were processed through point cloud matching,mosaic,vegetation filtering,and triangulated irregular network(TIN)-based modeling.As a result,a digital elevation model(DEM)with a spatial resolution of 0.1 m was obtained.This model allowed for a high-definition three-dimensional re-construction of the microgeomorphic features of faults.Furthermore,this study extracted the dextral horizontal offset amount of fault-controlled gullies and the vertical offset amount of fault scarps.Based on these data,as well as the valid-ation and comparison with the paleo-earthquake events revealed by geological mapping and trenches,this study conduc-ted a quantitative analysis of the fault activity characteristics in the Juxian-Tancheng segment of the Yishu fault zone.The results indicate that the horizontal and vertical offset amount along the Zuoshan(Yibujian),Zhonghuashan,Jishan,and Maolingshan segments of the Yishu fault zone exhibit grading characteristics,suggesting multi-phase(3‒5 times)activities and multiple paleo-earthquake events since the Late Quaternary.The findings of this study will provide an im-portant basis for further research on the kinematics and geometry of the Tan-Lu fault zone.They also demonstrate the wide application prospects of terrestrial laser scanning and airborne LiDAR in research on active faults.关键词
沂沭断裂带/激光雷达(LiDAR)/数字高程模型/断错地貌/定量分析/郯庐断裂Key words
Yishu fault zone/light detection and ranging(LiDAR)/digital elevation model(DEM)/offset geomorphic features/quantitative analysis/Tancheng-Lujiang fault分类
天文与地球科学引用本文复制引用
杨彬,王华林,吴洪斌,葛孚刚,邹昊,苏思丽..高精度LiDAR技术在活动断层断错地貌研究中的应用[J].煤田地质与勘探,2023,51(12):57-68,12.基金项目
山东省地震局重点业务专项项目(YW2303) （YW2303）
山东省地震局科技创新团队培育专项项目(TD202303) （TD202303）
山东省防震减灾"十三五"规划项目(SD135-2-3) （SD135-2-3）
